Imaging and Segmenting Grains and Subgrains Using Backscattered Electron Techniques
- University of Texas at Austin, TX (United States); Department of Mechanical Engineering, The University of Texas at Austin
- University of Texas at Austin, TX (United States)
We present two new methods of processing data from backscattered electron signals in a scanning electron microscope to image grains and subgrains. The first combines data from multiple backscattered electron images acquired at different specimen geometries to (1) better reveal grain boundaries in recrystallized microstructures and (2) distinguish between recrystallized and unrecrystallized regions in partially recrystallized microstructures. The second utilizes spherical harmonic transform indexing of electron backscatter diffraction patterns to produce high angular resolution orientation data that enable the characterization of subgrains. Subgrains are produced during high-temperature plastic deformation and have boundary misorientation angles ranging from a few degrees down to a few hundredths of a degree. Here, we also present an algorithm to automatically segment grains from combined backscattered electron image data or grains and subgrains from high angular resolution electron backscatter diffraction data. Together, these new techniques enable rapid measurements of individual grains and subgrains from large populations.
- Research Organization:
- Florida State University, Tallahassee, FL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Accelerator R&D and Production (ARDAP); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- SC0009960; 89233218CNA000001; NA0003525
- OSTI ID:
- 2477931
- Journal Information:
- Microscopy and Microanalysis, Journal Name: Microscopy and Microanalysis Journal Issue: 5 Vol. 30; ISSN 1431-9276
- Publisher:
- Microscopy Society of America (MSA)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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